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Which phone should I be using?

Lead qualification is optimised for Apple iOS 8.0 and
above on iPhone and iPad devices and Android devices running 4.0 (Ice Cream Sandwich)
and above. Our lead qualification service will not work via our mobile web
(.mobi) app.

The iPhone 4 has lower camera resolution than newer
devices which may make scanning slower. Scanning works best on iPhone 5 and
above.

Some devices will scan faster than others.

Variables
that affect all devices:

Light - digital cameras have
trouble in low-light situations, so somewhere brightly lit is better, but with
that said direct light is bad as it washes out the subject and the app relies
on contrast between the QR code and the background to get a good reading. Light,
reflection created by plastic pouches and print quality of badges all effect
the speed of making a scan using Lead Qualification.

Distance - each device type
seemed to have a preferred distance, from my (limited) testing iPhones seemed
to function better when the QR code filled the viewfinder, whereas Android
devices seemed to function better when the QR code was around half the size of
the viewfinder.

Autofocus - This is very handy,
especially if the QR code is being held close to the scanning device.